netdev - Re: [PATCH net-next v2 06/12] net: skbuff: don't include <net/page

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Message-ID: <20230526205410.3f849071@kernel.org>
Date: Fri, 26 May 2023 20:54:10 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Alexander Lobakin <aleksander.lobakin@...el.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Maciej Fijalkowski
 <maciej.fijalkowski@...el.com>, Magnus Karlsson
 <magnus.karlsson@...el.com>, Michal Kubiak <michal.kubiak@...el.com>,
 Larysa Zaremba <larysa.zaremba@...el.com>, Jesper Dangaard Brouer
 <hawk@...nel.org>, Ilias Apalodimas <ilias.apalodimas@...aro.org>,
 Christoph Hellwig <hch@....de>, Paul Menzel <pmenzel@...gen.mpg.de>,
 netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 06/12] net: skbuff: don't include
 <net/page_pool.h> into <linux/skbuff.h>

On Thu, 25 May 2023 14:57:40 +0200 Alexander Lobakin wrote:
> Currently, touching <net/page_pool.h> triggers a rebuild of more than
> a half of the kernel. That's because it's included in <linux/skbuff.h>.
> 
> In 6a5bcd84e886 ("page_pool: Allow drivers to hint on SKB recycling"),
> Matteo included it to be able to call a couple functions defined there.
> Then, in 57f05bc2ab24 ("page_pool: keep pp info as long as page pool
> owns the page") one of the calls was removed, so only one left.
> It's call to page_pool_return_skb_page() in napi_frag_unref(). The
> function is external and doesn't have any dependencies. Having include
> of very niche page_pool.h only for that looks like an overkill.
> Instead, move the declaration of that function to skbuff.h itself, with
> a small comment that it's a special guest and should not be touched.
> Now, after a few include fixes in the drivers, touching page_pool.h
> only triggers rebuilding of the drivers using it and a couple core
> networking files.

drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c

came in the meantime, and did not bother including page_pool.h.
-- 
pw-bot: cr